Solved: Re: Virtual Stackwise not Synchronizing

dannyh · ‎04-04-2023

Hello,

Recently I was advised on this forums to switch over to Virtual Stackwise from HSRP on the Core Switches we have running on the network. I have deleted all of the HSRP configurations and wiped the switch that is going to be the standby switch (call it Core Switch 2).

So far I have configured interfaces on both Core Switch 1 and 2 to have the SVL. DAD cannot be in place for the moment due to the physical limitation between the buildings (Core Switch 1 and 2 are in separate buildings for power redundancy). I have Configured the Switch Virtual-Stackwise and it's domain (101). I have prioritized Core Switch 1 to be 15 and renumbered and reprioritized Core Switch 2 as Switch 2 and Priority 14.

The issue is that when the connection between the switches are made, they are not synchronizing. I see Core Switch 2 displaying both interfaces numbered ten1/0/1 - 40 and ten2/0/1 - 40. I see in Core Switch 2's 'show switch' command that the switch 1 has no mac address but Core Switch 2 does. But in Core Switch 1, I only see Core Switch 1 in 'show switch' and I don't see interfaces ten2/0/1 - 40 like I do in Core Switch 2.

I tried to save and reload the switches multiple times and redo the configurations. What can I do in order to get these two switches synchronized where Core Switch 1 and 2 are sharing configurations (same control plane) like how Cisco documents are saying? Switches in use are Cisco Catalyst 9500 40 ports. I have checked the licensing, models, and the IOS and they are all same between the switches.

Reza Sharifi · ‎04-04-2023

Oh no, look like we have the 9500-40X models. So even if we get the module for the extended interfaces, we can't form SVL between the switches?

It appears to be so, but I would also open a ticket with TAC and make sure that is actually the case.

HTH

View solution in original post

balaji.bandi · ‎04-04-2023

You need to post the config, show version for us to verify. (Once SVL build switch will reboot, standby one you can not enter any commands at all (in your case different as you mentioned)

Follow exactly below guide it works : (just make sure you go with latest verison 17.6.X)

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html

here is my test setup :

https://www.balajibandi.com/?p=931

BB

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Reza Sharifi · ‎04-04-2023

Hi,

What is the output of "show stack-virtual and show stack-virtual link"?

Also, you can post "sh run"?

HTH

dannyh · ‎04-04-2023

CoreSW1 Show Run:
version 17.6
service timestamps debug datetime msec
service timestamps log datetime localtime show-timezone
service password-encryption
service call-home
no platform punt-keepalive disable-kernel-core
!
hostname
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
!
!
!
!
!
!
aaa session-id common
boot system switch all flash:packages.conf
clock timezone PST -8 0
clock summer-time PDT recurring
switch 1 provision c9500-40x
!
!
!
!
stackwise-virtual
domain 101
dual-active detection pagp trust channel-group 1
ip routing
!
!
ip nbar http-services
!
!
!
!
!
ip name-server 199.47.34.43 199.47.34.40
ip domain name mil.wa.lcl
!
!
!
login on-success log
!
!
!
!
!
qos queue-softmax-multiplier 400
!
!
!
!
!
!
!
!
!
!
!
!
!
!
license boot level network-advantage addon dna-advantage
!
!
diagnostic bootup level minimal
!
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree vlan
spanning-tree vlan
memory free low-watermark processor 132525
!
!
redundancy
mode sso
!
!
!
!
!
!
transceiver type all
monitoring
vlan dot1q tag native
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Port-channel1
!
interface Port-channel41
switchport mode trunk
!
interface Port-channel43
switchport mode trunk
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
no ip address
shutdown
negotiation auto
!
interface TenGigabitEthernet1/0/1
switchport mode trunk
!
interface TenGigabitEthernet1/0/2
shutdown
!
interface TenGigabitEthernet1/0/3
switchport mode trunk
channel-group 41 mode active
!
interface TenGigabitEthernet1/0/4
switchport mode trunk
channel-group 41 mode active
!
interface TenGigabitEthernet1/0/5
switchport mode trunk
!
interface TenGigabitEthernet1/0/6
switchport mode trunk
!
interface TenGigabitEthernet1/0/7
!
interface TenGigabitEthernet1/0/8
!
interface TenGigabitEthernet1/0/9
!
interface TenGigabitEthernet1/0/10
!
interface TenGigabitEthernet1/0/11
switchport mode trunk
!
interface TenGigabitEthernet1/0/12
switchport mode trunk
!
interface TenGigabitEthernet1/0/13
switchport mode trunk
!
interface TenGigabitEthernet1/0/14
switchport mode trunk
!
interface TenGigabitEthernet1/0/15
description Link_To_ASA
!
interface TenGigabitEthernet1/0/16
switchport mode trunk
!
interface TenGigabitEthernet1/0/17
switchport mode trunk
!
interface TenGigabitEthernet1/0/18
switchport mode trunk
!
interface TenGigabitEthernet1/0/19
shutdown
!
interface TenGigabitEthernet1/0/20
switchport mode trunk
!
interface TenGigabitEthernet1/0/21
switchport mode trunk
!
interface TenGigabitEthernet1/0/22
switchport mode trunk
!
interface TenGigabitEthernet1/0/23
switchport mode trunk
!
interface TenGigabitEthernet1/0/24
no switchport
ip address
ip nbar protocol-discovery
!
interface TenGigabitEthernet1/0/25
switchport mode trunk
!
interface TenGigabitEthernet1/0/26
switchport mode trunk
!
interface TenGigabitEthernet1/0/27
switchport mode trunk
!
interface TenGigabitEthernet1/0/28
switchport mode trunk
!
interface TenGigabitEthernet1/0/29
switchport mode trunk
!
interface TenGigabitEthernet1/0/30
switchport mode trunk
!
interface TenGigabitEthernet1/0/31
switchport mode trunk
!
interface TenGigabitEthernet1/0/32
no switchport
ip address
!
interface TenGigabitEthernet1/0/33
switchport mode trunk
channel-group 43 mode active
!
interface TenGigabitEthernet1/0/34
switchport mode trunk
channel-group 43 mode active
!
interface TenGigabitEthernet1/0/35
switchport mode trunk
channel-group 43 mode active
!
interface TenGigabitEthernet1/0/36
switchport mode trunk
!
interface TenGigabitEthernet1/0/37
switchport mode trunk
channel-group 1 mode desirable
!
interface TenGigabitEthernet1/0/38
stackwise-virtual dual-active-detection
description Link_To_CoreSW2
!
interface TenGigabitEthernet1/0/39
stackwise-virtual link 1
description Link_To_CoreSW2
!
interface TenGigabitEthernet1/0/40
stackwise-virtual link 1
description Link_To_CoreSW2
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2
!
interface TenGigabitEthernet1/1/3
!
interface TenGigabitEthernet1/1/4
!
interface TenGigabitEthernet1/1/5
!
interface TenGigabitEthernet1/1/6
!
interface TenGigabitEthernet1/1/7
!
interface TenGigabitEthernet1/1/8
!
interface FortyGigabitEthernet1/1/1
!
interface FortyGigabitEthernet1/1/2

ip ssh time-out 60
ip ssh version 2
ip scp server enable

control-plane
service-policy input system-cpp-policy

end

Core SW 1 Show Stackwise-Virtual:

Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 101

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/39
TenGigabitEthernet1/0/40

Core Switch 1 Show Stackwise-Virtual Link:

Stackwise Virtual Link(SVL) Information:
----------------------------------------
Flags:
------
Link Status
-----------
U-Up D-Down
Protocol Status
---------------
S-Suspended P-Pending E-Error T-Timeout R-Ready
-----------------------------------------------
Switch SVL Ports Link-Status Protocol-Status
------ --- ----- ----------- ---------------
1 1 TenGigabitEthernet1/0/39 D S
TenGigabitEthernet1/0/40 D S

Core Switch 2 Show Run:

Switch#show run
Building configuration...

Current configuration : 12073 bytes
!
! Last configuration change at 00:16:02 UTC Thu Mar 30 2023
!
version 17.6
service timestamps debug datetime msec
service timestamps log datetime msec
service call-home
platform punt-keepalive disable-kernel-core
!
hostname Switch
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
!
no aaa new-model
switch 1 provision c9500-40x
switch 2 provision c9500-40x
!
!
!
!
stackwise-virtual
domain 101
dual-active detection pagp trust channel-group 1
!
!
!
!
!
!
!
!
login on-success log
!
!
!
!
!
!
!
!
!

!
!
license boot level network-advantage addon dna-advantage
!
!
diagnostic bootup level minimal
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
memory free low-watermark processor 131709
!
!
redundancy
mode sso
!
!
!
!
!
!
transceiver type all
monitoring
!
!
!
policy-map system-cpp-policy
!
!
!
!
!
!
!
!
!
!
!
!
interface Port-channel1
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
no ip address
shutdown
negotiation auto
!
interface TenGigabitEthernet1/0/1
!
interface TenGigabitEthernet1/0/2
!
interface TenGigabitEthernet1/0/3
!
interface TenGigabitEthernet1/0/4
!
interface TenGigabitEthernet1/0/5
!
interface TenGigabitEthernet1/0/6
!
interface TenGigabitEthernet1/0/7
!
interface TenGigabitEthernet1/0/8
!
interface TenGigabitEthernet1/0/9
!
interface TenGigabitEthernet1/0/10
!
interface TenGigabitEthernet1/0/11
!
interface TenGigabitEthernet1/0/12
!
interface TenGigabitEthernet1/0/13
!
interface TenGigabitEthernet1/0/14
!
interface TenGigabitEthernet1/0/15
!
interface TenGigabitEthernet1/0/16
!
interface TenGigabitEthernet1/0/17
!
interface TenGigabitEthernet1/0/18
!
interface TenGigabitEthernet1/0/19
!
interface TenGigabitEthernet1/0/20
!
interface TenGigabitEthernet1/0/21
!
interface TenGigabitEthernet1/0/22
!
interface TenGigabitEthernet1/0/23
!
interface TenGigabitEthernet1/0/24
!
interface TenGigabitEthernet1/0/25
!
interface TenGigabitEthernet1/0/26
!
interface TenGigabitEthernet1/0/27
!
interface TenGigabitEthernet1/0/28
!
interface TenGigabitEthernet1/0/29
!
interface TenGigabitEthernet1/0/30
!
interface TenGigabitEthernet1/0/31
!
interface TenGigabitEthernet1/0/32
!
interface TenGigabitEthernet1/0/33
!
interface TenGigabitEthernet1/0/34
!
interface TenGigabitEthernet1/0/35
!
interface TenGigabitEthernet1/0/36
description Link to DistSW1
switchport mode trunk
channel-group 1 mode desirable
!
interface TenGigabitEthernet1/0/37
description Link to DistSW2
switchport mode trunk
channel-group 1 mode desirable
!
interface TenGigabitEthernet1/0/38
!
interface TenGigabitEthernet1/0/39
!
interface TenGigabitEthernet1/0/40
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2
!
interface TenGigabitEthernet1/1/3
!
interface TenGigabitEthernet1/1/4
!
interface TenGigabitEthernet1/1/5
!
interface TenGigabitEthernet1/1/6
!
interface TenGigabitEthernet1/1/7
!
interface TenGigabitEthernet1/1/8
!
interface FortyGigabitEthernet1/1/1
!
interface FortyGigabitEthernet1/1/2
!
interface TenGigabitEthernet2/0/1
!
interface TenGigabitEthernet2/0/2
!
interface TenGigabitEthernet2/0/3
!
interface TenGigabitEthernet2/0/4
!
interface TenGigabitEthernet2/0/5
!
interface TenGigabitEthernet2/0/6
!
interface TenGigabitEthernet2/0/7
!
interface TenGigabitEthernet2/0/8
!
interface TenGigabitEthernet2/0/9
!
interface TenGigabitEthernet2/0/10
!
interface TenGigabitEthernet2/0/11
!
interface TenGigabitEthernet2/0/12
!
interface TenGigabitEthernet2/0/13
!
interface TenGigabitEthernet2/0/14
!
interface TenGigabitEthernet2/0/15
!
interface TenGigabitEthernet2/0/16
!
interface TenGigabitEthernet2/0/17
!
interface TenGigabitEthernet2/0/18
!
interface TenGigabitEthernet2/0/19
!
interface TenGigabitEthernet2/0/20
!
interface TenGigabitEthernet2/0/21
!
interface TenGigabitEthernet2/0/22
!
interface TenGigabitEthernet2/0/23
!
interface TenGigabitEthernet2/0/24
!
interface TenGigabitEthernet2/0/25
!
interface TenGigabitEthernet2/0/26
!
interface TenGigabitEthernet2/0/27
!
interface TenGigabitEthernet2/0/28
!
interface TenGigabitEthernet2/0/29
!
interface TenGigabitEthernet2/0/30
!
interface TenGigabitEthernet2/0/31
!
interface TenGigabitEthernet2/0/32
!
interface TenGigabitEthernet2/0/33
!
interface TenGigabitEthernet2/0/34
!
interface TenGigabitEthernet2/0/35
!
interface TenGigabitEthernet2/0/36
!
interface TenGigabitEthernet2/0/37
!
interface TenGigabitEthernet2/0/38
stackwise-virtual dual-active-detection
!
interface TenGigabitEthernet2/0/39
stackwise-virtual link 1
description Link To CoreSW1
!
interface TenGigabitEthernet2/0/40
stackwise-virtual link 1
description Link To CoreSW1
!
interface TenGigabitEthernet2/1/1
!
interface TenGigabitEthernet2/1/2
!
interface TenGigabitEthernet2/1/3
!
interface TenGigabitEthernet2/1/4
!
interface TenGigabitEthernet2/1/5
!
interface TenGigabitEthernet2/1/6
!
interface TenGigabitEthernet2/1/7
!
interface TenGigabitEthernet2/1/8
!
interface FortyGigabitEthernet2/1/1
!
interface FortyGigabitEthernet2/1/2
!

!
!

end

Core SW 2 show stackwise-virtual:

Switch#show stackwise-virtual
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 101

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
2 1 TenGigabitEthernet2/0/39
TenGigabitEthernet2/0/40

Core Switch 2 show stackwise-virtual link:

Switch#show stackwise-virtual
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 101

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
2 1 TenGigabitEthernet2/0/39
TenGigabitEthernet2/0/40

Switch#show stackwise-virtual link
Stackwise Virtual Link(SVL) Information:
----------------------------------------
Flags:
------
Link Status
-----------
U-Up D-Down
Protocol Status
---------------
S-Suspended P-Pending E-Error T-Timeout R-Ready
-----------------------------------------------
Switch SVL Ports Link-Status Protocol-Status
------ --- ----- ----------- ---------------
2 1 TenGigabitEthernet2/0/39 D S
TenGigabitEthernet2/0/40 D S

Reza Sharifi · ‎04-04-2023

2 1 TenGigabitEthernet2/0/39 D S
TenGigabitEthernet2/0/40 D S

Are the physical links (2/0/39, 40 and 1/0/39, 40) are all up and running?

What is the output of "sh ip int brief ten1/0/39" and 1/0/40?

Reza Sharifi · ‎04-04-2023

What model 9500 are these switches. See below link for restrictions:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-10/configuration_guide/ha/b_1610_ha_9500_cg/configuring_cisco_stackwise_virtual.html

Restrictions for Cisco Catalyst 9500 Series Switches

When configuring StackWiseVirtual links (SVLs) on 9500-40X and C9500-16X models of the Cisco Catalyst 9500 Series Switches, note that you cannot create SVLs on any of the network modules.
4x10G breakout cables are not supported with SVL mode.

Restrictions for Cisco Catalyst 9500 Series High Performance Switches

4x25G and 4x10G breakout cables are not supported with SVL mode.
On C9500-32C switches, you can configure SVL and DAD only on interfaces numbered 1-16 on the front panel of the switch.
On C9500-32QC, you can configure SVL and DAD only on native 100G and 40G interfaces (default configuration ports). You cannot configure SVL and DAD on converted 100G and 40G interfaces.
On Cisco Catalyst 9500 Series High Performance Switches, configuring SVL using 1G interfaces is not supported.

dannyh · ‎04-04-2023

Oh no, look like we have the 9500-40X models. So even if we get the module for the extended interfaces, we can't form SVL between the switches?

Reza Sharifi · ‎04-04-2023

Oh no, look like we have the 9500-40X models. So even if we get the module for the extended interfaces, we can't form SVL between the switches?

It appears to be so, but I would also open a ticket with TAC and make sure that is actually the case.

HTH

dannyh · ‎04-04-2023

Thank you for your assistance. I was so caught up on trying to fix the issue that I didn't look into the capabilities of the switches we have.

Reza Sharifi · ‎04-04-2023

Sure! When I was going through your config, I remembered that there are some limitations on these boxes and had seen a few posts where people were trying to configure the VSL links and it wasn't working for them.

Good luck and let us know if you have more questions.